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CD-57

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Mechanical cipher machine

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The(Hagelin) CD-57 was a portable, mechanical cipher machine manufactured byCrypto AG, first produced in 1957.^[1] It was derived from the earlierCD-55, and was designed to be compatible with the largerC-52 machines. Compact, the CD-57 measured merely 5 1/8in × 3 1/8in × 1 1/2in (13 × 8 × 3.8 cm) and weighed 1.5 pounds (680 gr). The CD-57 used six wheels.

A variant is theCD-57(RT), a similar device using aone-time pad system rather than rotating wheels. TheSTG-61 was a licensed copy of the CD-57 by Hell.^[2]

Sullivan (2002) shows how the CD-57 can be attacked using ahill climbing search technique.

Notes

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^one website gives the production dates as "1956 and 1957"[1], another website says "first produced in 1957""Cd-57 Handheld 6-Rotor Cryptographic Machine by Crypto Ag". Archived fromthe original on March 17, 2006. RetrievedDecember 9, 2005. .
^[2]Archived December 29, 2004, at theWayback Machine

References

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Wayne G. Baker, Solving a Hagelin, Type CD-57, Cipher,Cryptologia, 2(1), January 1978, pp1–8.
Louis Kruh, Cipher Equipment: Hagelin Pocket Cryptographer, Type CD-57,Cryptologia, Volume 1, 1977, pp255–260.
Geoff Sullivan, Cryptanalysis of Hagelin machine pin wheels,Cryptologia, 26(4), pp257–273, October 2002.

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Wikimedia Commons has media related toCD-57.

v t e Cipher machines
Rotor machines	CCM Enigma M-125 Fialka Hebern HX-63 KL-7 Lacida M-325 Mercury NEMA OMI RED SG-39 SG-41 SIGABA SIGCUM Singlet Typex
Mechanical	Bazeries cylinder C-36 C-52 CD-57 Cipher disk HC-9 Kryha Jefferson disk M-94 M-209 Reihenschieber Scytale
Teleprinter	5-UCO BID 770 DUDEK KW-26 KW-37 Lorenz SZ 40/42 Siemens and Halske T52 SIGTOT
Secure voice	BID 150 FASCINATOR KY-3 KY-58 KY-68 NESTOR OMNI SCIP Sectéra Secure Module SIGSALY STE STU-II STU-III VINSON
Other	JADE KG-84 KL-43 KL-51 Noreen Red Purple Pinwheel Rockex
Computer hardware	AES instruction set Intel SHA extensions IBM 4758 IBM 4764

v t e Cryptography
General	History of cryptography Outline of cryptography Classical cipher Cryptographic protocol Authentication protocol Cryptographic primitive Cryptanalysis Cryptocurrency Cryptosystem Cryptographic nonce Cryptovirology Hash function Cryptographic hash function Key derivation function Secure Hash Algorithms Digital signature Kleptography Key (cryptography) Key exchange Key generator Key schedule Key stretching Keygen Machines Cryptojacking malware Ransomware Random number generation Cryptographically secure pseudorandom number generator (CSPRNG) Pseudorandom noise (PRN) Secure channel Insecure channel Subliminal channel Encryption Decryption End-to-end encryption Harvest now, decrypt later Information-theoretic security Plaintext Codetext Ciphertext Shared secret Trapdoor function Trusted timestamping Key-based routing Onion routing Garlic routing Kademlia Mix network
Mathematics	Cryptographic hash function Block cipher Stream cipher Symmetric-key algorithm Authenticated encryption Public-key cryptography Quantum key distribution Quantum cryptography Post-quantum cryptography Message authentication code Random numbers Steganography
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