201108061214 jb62l
solved decrypted manual
A quotation: 'Security is mostly a superstition...'. 3DES, key MD5(name).
From the post to its content
As posted (encrypted)
17DBD64A 7B7744BD F2B3EAFC 8113AC91 631B8B27 BB3ECB62 F704B263 DA161A3B C5AEBADD 5C8EEF43 A3841036 F178F887 A35459AC C780050A 6F15E874 4E2E2486 2C566313 32151F87 7E5254A1 3252F61C 378229CA 6474DC51 7CBE9AC1 A90A1961 07F663C0 4B800F8B A6695967 7D786703 BB00F5A3 3258F454 1F59D5CC 977991C4 9AECA9EC C19E37B1 2CED31D2 923EC374 1D490543 11298538 DC13BD0A 109C69ED 969F475B 48E4881D 4EFCA84D 69DFDEB8 2B5FB315 EAEFA1DD E1FE1AE3 8D27052B 583E2D3E AB25939D 3C114489 446A6D95 7C8CA6DA 0EA98A03 00CE6985 194DB2C0 922808B4 D7F0E229 83372FB4 093D8CAC FF7D1A25 84E6D53C AA4B9DE2 9BD95BF4 0357F1C3 5E13AF58 E615B4AB 2A4A96B2
- Decrypt. Key: MD5(name) ECB. 3DES-EDE2, then strip the PKCS7 padding.
Decrypted
Security is mostly a superstition. It does not exist in nature, nor do the children of men as a whole experience it. Avoiding danger is no safer in the long run than outright exposure. Life is either a daring adventure, or nothing.
-Helen Keller
Explanation
201108061214 — DES-EDE ECB quotation
Status: verified decryption.
This is one of six 2011 posts that use the same recipe (the others: igg5w, j7525, j7xpy, j95o6, jbnny):
- Decode the body from hexadecimal.
- Use DES-EDE (two-key Triple DES) in ECB mode with the 16-byte key MD5(
A858DE45F56D9BC9). - Remove the PKCS#7 padding.
The SHA-256 of the plaintext, for checking a decryption byte for byte:
9fe7a641db70adf08e86e9df2dab7c37fefe44aef4210e45d5e5f8281e1e2e18
The output is the Helen Keller quotation beginning: Security is mostly a superstition. It does not exist in nature.
Solution summary
- Method
- 3DES-ECB, key MD5(name)
- Result
- prose quotation
- Explanation
- Community-known text