rsa lesson added

training/h4tum/Intro_to_RSA/challenge/small e/4.py

@@ -0,0 +1,25 @@
+from Crypto.Util.number import inverse, getPrime, bytes_to_long
+
+
+flag = "h4tum{...}"
+m = bytes_to_long(flag.encode())
+
+p = getPrime(512)
+q = getPrime(512)
+n = p * q
+phi = (p - 1) * (q - 1)
+e = 3
+d = inverse(e, phi)
+
+
+ciphertext = pow(m, e, n)
+
+print(f"Here is the public key:\nn = {n}\ne = {e}")
+print(f"\nHere is the encrypted flag:\n{ciphertext}")
+
+# Here is the public key:
+# n = 133754776379084890949396128184054209827880534649872344546551916044637014117738848312911601805615413451730371613447269527792021869628568786604565343522407135622719358245312844577182399504053254247235363664243271537669953064325407487226101646170736997104441396305543325547272540155515055362880210828933349672043
+# e = 3
+
+# Here is the encrypted flag:
+# 27485520006079233807623807132370137913974673072796110190145166712012781629787795173249446320555776530359265337337323534643030075414274984551090326260078977798035707372748401792308537889036666723735654189543943146031289186076736572201980302715998036022634187371997765033713933871352433152430973165071957865672